Non-Rising Stem Resilient Seated Gate Valve

The Non-Rising Stem Resilient Seated Gate Valve is a critical component in modern water distribution and industrial fluid systems. Its design ensures precise control, reliable shut-off, and long-term operational stability. Unlike rising stem valves, the stem of this valve rotates within a fixed nut, allowing installation in confined spaces where vertical clearance is limited. This compact design makes it highly suitable for urban water pipelines and building systems.

Design and Operation

This valve consists of a ductile iron body, a brass stem nut, and an EPDM resilient seat. The disc moves linearly to block or allow water flow, while the non-rising stem rotates within the nut. The resilient seat compresses to form a tight seal, reducing the risk of leakage even under fluctuating pressure conditions. The non-rising stem design also protects the stem threads from corrosion and damage, ensuring a longer service life.

Technical Specifications

• Standard Compliance: AWWA C509-87, ISO 9001 Certified Manufacturing
• Pressure Rating: Up to 200 psi (PN16)
• Temperature Range: 0°C to 80°C for potable water
• Materials: Ductile iron body, brass stem nut, EPDM resilient seat
• Sizes: 3" to 12" nominal pipe size (DN80-DN300)
• Connection Type: Flanged, compliant with EN 1092-2

Applications

This valve is widely used in municipal water distribution networks, commercial buildings, and industrial piping systems. Its compact design allows installation in underground chambers, tight utility corridors, and pump stations. The resilient seat provides excellent sealing performance for water, wastewater, and other low-corrosive fluids. It is also suitable for systems where intermittent operation is required, reducing maintenance needs.

Installation Guidelines

Proper installation is essential for optimal performance. The valve should be installed in a horizontal or vertical orientation as specified by the manufacturer. Ensure that the pipeline is properly aligned and free of debris before installation. Torque should be applied gradually when tightening flange bolts to prevent stress on the valve body. During installation, it is important to verify that the valve fully opens and closes without obstruction.

Maintenance Recommendations

Maintenance for non-rising stem resilient seated gate valves is minimal but crucial for longevity. Regular inspection of the valve seat and disc is recommended to detect wear or damage. Lubrication of the stem nut can help maintain smooth operation. In cases where the valve is buried, access points should be checked periodically to ensure the valve operates freely and there is no leakage. The EPDM seat can be replaced without removing the entire valve, simplifying maintenance procedures.

Industry Standards and Compliance

This valve meets the requirements of AWWA C509-87 for resilient seated gate valves and is manufactured under ISO 9001 quality management standards. Flanged connections comply with EN 1092-2, ensuring compatibility with standard pipeline systems. Compliance with these standards guarantees safety, reliability, and global acceptability for diverse water system applications.

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